Weft detecting mechanism for double shuttle looms



C. E. BROWN Aug. 23, 1932.

WEFT DETECTING MECHANISM FOR DOUBLE SHUTTLE LOOMS \9mfentor Brown I'M Filed May 13, 1931 m uw .30

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lllll Clyde 6;.

i Qtto Patented Aug. 23, 1932 UNITED srArs CLYDE E. BROWN, or woncnsrne, nnssscrrusnrrs,"ess enon "ro sacral-iron a KNOWLES LOOM WORKS,

MASSACHUSETTS WEFT nnrnornve MECHANISM ronl'nournn snurrtnltoom's' 7 Application filed May 13,

of the weft supply ina shuttle about to become active but will give no indication a shuttle about to become inactive.

A further object is to provide a construction by which the weft detectors will continue to indicate a shuttle which remains for for several picks in active or running position but will cease such indication when" said shuttle isabout to become inactive.

My invention further relates to arrangements andcombinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

'A preferred form of the invention is shown 2 in the drawing, in which convenient manner. shuttlesS and S are received in the upper embodying my improvements, with the lay and shuttles shown in section;

Fig. 2 is-a sectional plan View of the weft detecting mechanism, taken along the line 2-2 in Fig. 1, 1

Figs. 3 and 4 are diagrammatic'views, illustrating the operation of my invention, and

Fig. 5 is a detail sectional along the line 5-5 in Fig. 2. I

Referringto the drawing, 1 have shown a portion of a loom frame having a bracket 11 secured thereto. The bracket 11'is provided with upwardly extending guideways 12 for a bar 13, slidably mounted therein. Arms 15 and 16 project laterally from the slide bar 13 and constitutesupports for upper and'lower weft detecting devices WV and W. The slide bar 13 is also provided with a stud or projection 20 for a purpose to be described. p

The usual lay 22 is provided with drop boxes 23 mounted on the usual lifter rod 24 view, taken and'positioned by the usual box mechanism,

controlled by a pattern chain or in any other Upper and lower r -an1s1n.& Fig. 1 is a side elevation of partsof a loom 1931. seriaru seapeb.

and lower drop boxes respectively; 'The upper weft' detecting device W has a deor woncnsrrn, MASSACHUSETTS, A CORPORATION or t'ecting member D adapted to contact'with the bobbin 3 in the upper shuttle S and the lower detecting device W"*has' detecting member D adapted to contact -with the bobbin B" in the lower -shuttle S; l A bracket'30 is secured to the'lower side ofthe' drop boxes 23 and'isprovided with 'a 5 segmental slot 31 at its forward end, within which thestud 20-is received as the lay 22 and thedrop bores 23 movejforward'. 7 After the stud 2O enters-the slot 31, the detecting device'sp'artake of the upward or downward movement of the boxes. i

* An elongated transmitting member '40 (Fig. 1) ;-is pivoted at 41 on the bracket 11 1 and isfprovided with an arm 42.=adaptedto,

be swung-into the path of a chopper lever 43 constituting apart of the actuating connections of the usual weft replenishing mech- When thearm' 42 is swung into the path of the lever 43, weft replenishment will be initiated but'when' the arm 42 is out of the path of movement of the lever 43, the lever 43 will remain inoperative. These lconnecacne are ofthe usual type andvinthemselves. V

constituteno part of'my' present invention. 1

, The detectingdevices W and W are iden- 1 ticalfin construction and the details of construction of the upperdetecting device W are shown in Fig. 2." The detecting member "D is pivoted at 50 ona slide 51', formed in two'parts and having a lug or projection 52 at its forward end. *Asin'gle spring 53'moves the detecting deviceD' and slide'51-rearward and also holds the detecting device D against a stop pin 54. 1

v Vhen engaged bva substantial supply of 'weft on'a" bobbin B, the detector D moves forward in a-straight' line without angular movement and slides pastthe transmitting device without imparting angular movement thereto. If, however, the weft is substantially exhausted on the bobbin engaged by the detector D, the detector swings'on its pivot inthe direction of the arrow 01 in Fig.- 2,5 causing corresponding movement of the transmitting-device 40 and arm 42 and thus rendering the weft replenishing mechanism active. The lower detecting device D is provided with a projection 52, correspond ing to the lug 52 of the detecting device D.

It is desirable that the condition of-the weft be indicated only in .azshuttleiaboutto become active or about toremain active,and not in a shuttle about to become inactive.

Forthis purpose I *provide "upper and lowershields'60 and 61,pivoted at=62 and 63 on the side of the front guideways 12. These shields are provided with side flanges 64 and 65 and'addition'al fixed lugs or projections 66 and 67 are associatedtherewith. The

flanges 64 and 65 have cam-shaped portions inclined inwardly, which operate as will be .hereinafter described. These-'flanges 64=and '65 are cut away or shortened ateach end thereof and the shield members are held yieldingly in the positions shown in Fig. 1

by springs 68. H r V A spring plunger 7 0 :is mounted in the stand or support 11 andis adapted to engage upper and lower notches 71 and 7 2 in the back side ofthe slide bar 13. TheplungerZO yieldingly prevents upward or downward the will beheld forward out-.of operativeposi v t-ion by engagement of thelug I52 Witl1 the ..upper fixed projection66, while*the lower projection 52 will be positioned betweenthe .adja'cent ends ofthe upper 'andilower shields ,60and 61. Consequently. the upper detector will-beheld inoperative,;while thelower detector willbefree to operate.

When the boxes are lowered, however, the engagement of the bracket .30 with the stud 20 will causethe detecting devices tobe correspondingly moved downward. :As the detecting devicesmove downward, the lug .52 Tof the lower detecting device D will 'engage the flange '65 "of the lower *shield 61 .and will be moved forward to.inoperativep'osition, as shown by the arrows in the lower part. of Fig. 3. 1-

As the boxesreach their-extreme lowered position, the lug 52"willslipoif of the lower end of the flange 65 but will be caught by the lower fixed projection '67, as shown at the bottomof Fig. 4, and willthus beheld inoperative so long asthe boxes remainin lowered position. w 7

During the same downward movement of the boxes, the projection 52 of the upper; detector slide 51willshpdownward'and ofi of weft supply in the upper shuttle S, as the upper shuttle moves downward to active position.

When the boxes reachtheir-extreme i'o'w- ---ered position, the lug 52 occupiestheinid position indicated in Fig.4 and'will continue to indicate the upper shuttle S until the boxes are'again moved'upward, when the lowerdetecting device D will become operative and the lug 52 will follow the path of the arrowsindicated in the upper part of Fig.- 4, holding the upper detecting device D inoperative. a I 7V w I have thus provided very'sim'pleinfecha nisrn'for holding a detectorinoperative so..

long. as the corresponding shuttle remains in-"' 'operativeand until the shuttleis about to be:

. come active, and I haveialso provided mechanism by whichthe detecting device associated with a shuttlein running positionwill P remainoperative until said shuttle is about to become inactive. Furthermore, thise'xtreme'ly desirable result isattainedby a very simple addition to the usual weft detector imechanism. r 1 7 i The object of forming the detector slide 51 in two parts is to providelost motion, so that the projections 52 and. 5.2 will not be forced.

against the under sides, ofthe flanges 64 .or' 65 during a detecting movement, thus llIl-f necessarily increasing the pressure on the detector and weft. V 1 5 Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed,other-iwise than as set forth in the claims,'but;what I Iclaimis:

1. In a loom having a pair of shuttle? boxes, means to shiftsaidfboxes and a weft detecting device associated with each shuttle box,

in combination, a separate, shieldfor each detecting device effective to render its associated device inoperative when the associated shuttle is becoming inactive, and an additional device efiective to hold said detecting device inoperative until the associated shuttle is about to become again active.

2. In a loom having a pair of shuttle boxes, I

means to shift said boxes and a weft detecting device associatedwith each shuttle box,

incoinbination, a separate shield for each detecting device effective to render lts assoclated device inoperative as the associated shuttle is moving to inactive position, and 7 an additional device effective to hold said :1 detecting device inoperative untilthe associ ated shuttlebegins a return movement to active position. 7

V 3. In a loom having a pair of shuttle boxes,

means toshiftsaid boxes and, a weft detect- 330 ing device associated with each shuttle box, in combination, a separate shield for each detecting device effective to render its associated device inoperative as the associated shuttle is removed vertically from running position, and an additional device efl'ective to hold said detecting device inoperative until the associated shuttle begins to move vertically back to running position.

4:. The combination in a loom as set forth in claim 2, in which each weft detecting device has a lateral projection and in which each associated shield has a cam-shaped flange positioned for engagement by said lateral projection when the associated shuttle is moving to inactive position, said flange being shorter at each end than the limits of travel of said lateral projection, and in which a fixed abutment is provided for engagement by said lateral projection when in its extreme inactive position.

5. In a loom having a pairof shuttle boxes, means to shift said boxes and a weft detecting device associated with each shuttle box, in combination, means to move forward to inoperative position the. weft detecting device associated with the shuttle becoming inactive and to thereafter release said device, and additional means to thereupon engage and hold said released detecting device 1noperative until return movement of said shuttle to active position has begun.

6. In a loom having a pair of shuttle boxes, means to shift said boxes and a weft detecting device associated with each shuttle box, in combination, a shield associated with each detecting device, said shield having a camshaped flange and said detecting device having a portion moving behind said flange from inactive to active position of the associated shuttle and moving in front of said flange and in engagement therewith as the associated shuttle moves from active to inactive position, and separate means to hold said detecting device inactive'when said shuttle is in extreme inactive position and until the return movement of said shuttle to active posltlon begins.

7. The combination in a loom as setforth 1 V in claim 6, in which each separate means is positioned slightly rearward of its associated flange, whereby said detecting device is disengaged from said flange but is maintained; inoperative by sald separate means after such engagement and while in extreme inactive position.

In testimony whereof I have hereunto affixed my signature.

CLYDE E. BROWN. 

